Hi, On 15/02/2015 23:12, intrig...@debian.org wrote: > > the aufs patch set is going away from Debian, e.g. it's been removed > in Linux 3.18 as found in experimental. It's being superseded by > overlay FS.
Oh, yes, I didn't notice > On a Debian Live system with Linux 3.18 and union=overlayfs, > /lib/bilibop/test fails to identify the (USB) boot device as being on > the same underlying device as the root FS, and in turn bilibop fails > to tweak the ownership of the device nodes as it's supposed to do. > > I've only tested with bilibop 0.4.21~bpo70+1, as that's what we're > using, and I've not seen any obviously related change in the > newest releases. You're right. bilibop-common and -udev are not affected by changes from 0.4.21. The fact is that overlayfs is currently not supported at all by bilibop. It's not by design, just a missing support that I'll try to provide soon. > This is one of the blockers for Tails to upgrade its kernel to 3.18+. > > For your convenience, a test ISO will soon be available there: > http://nightly.tails.boum.org/build_Tails_ISO_feature-linux-3.18/ > > To reproduce, install it to a USB stick with Tails Installer, or just > `dd' it to a USB stick (it's a hybrid ISO). I've not tested the > latter, but I guess it'll produce the same results. I confirm, dd it to a USB stick produces the same results. But it gives me a working environment to modify-and-test bilibop-common, thank you. My first experiments show that this is not obvious to find the device mounted on the 'lowerdir' component of the overlay filesystem. The value found in /proc/mounts (lowerdir=//filesystem.squashfs/) comes from the initrd environment; it does not exist anymore at runtime as the mountpoint has been moved to '/lib/live/mount/rootfs/filesystem.squashfs'. These paths entirely depend on live-boot (5.0~a1-1 in experimental). So I try to figure how to find the lowerdir without previous knowledge of what it could be, and fallback to live-boot usecases. This means that portable code is not yet written, but some changes usable by debian-based live systems (at least Tails) have already been tested and work. I will push them soon, follow the branch 'experimental/overlayfs_support' [1]. Cheers, quidame [1] https://un.poivron.org/~quidame/git/bilibop.git
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